Finding the Third Proportional to 200,990 and 425,812

Step by Step Solution

1. Step 1: Write the proportion equation
   200,990 : 425,812 = 425,812 : x
2. Step 2: Convert to fraction form
   200,990/425,812 = 425,812/x
3. Step 3: Cross multiply
   200,990x = 425,812 × 425,812
4. Step 4: Simplify right side
   200,990x = 181,315,859,344
5. Step 5: Solve for x
   x = 181,315,859,344/200,990
6. Step 6: Final answer
   x = 902,113.83